When to Plant Rhubarb in San Jose, California (95113)

Location

San Jose, California

ZIP Code

95113

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, December 16, 2025

Transplant Outdoors Tuesday, February 24, 2026

Pro Tip: Start Rhubarb seeds indoors 8 weeks before your last frost date, then transplant outdoors around Tuesday, February 24, 2026.

🌿 Plant Details

Scientific Name Rheum rhabarbarum

Days to Maturity 365 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 8-21 days

Ready to Plant Rhubarb in San Jose?

Get your seeds now so they're ready by Tuesday, December 16, 2025.

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Growing Rhubarb in Zone 9b

Rhubarb (Rheum rhabarbarum) is a popular garden vegetable. In San Jose, California, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, December 16, 2025.

Your average last frost date is Tuesday, February 10, 2026. Plan to transplant your Rhubarb seedlings outdoors around Tuesday, February 24, 2026, about 2 weeks after your last frost date.